Converting upper-case string into title-case using Ruby - ruby

Question

I'm trying to convert an all-uppercase string in Ruby into a lower case one, but with each word's first character being upper case. Example:
convert "MY STRING HERE" to "My String Here".
I know I can use the .downcase method, but that would make everything lower case ("my string here"). I'm scanning all lines in a file and doing this change, so is there a regular expression I can use through ruby to achieve this?
Thanks!

Answer 1

If you're using Rails (really all you need is ActiveSupport, which is part of Rails), you can use titleize:
"MY STRING HERE".titleize
# => "My String Here"
If you're using plain Ruby but don't mind loading a small amount of ActiveSupport you can require it first:
require 'active_support/core_ext/string/inflections'
# => true
"MY STRING HERE".titleize
# => "My String Here"
N.B. By default titleize doesn't handle acronyms well and will split camelCaseStrings into separate words. This may or may not be desirable:
"Always use SSL on your iPhone".titleize
# => "Always Use Ssl On Your I Phone"
You can (partially) address this by adding "acronyms":
require 'active_support/core_ext/string/inflections' # If not using Rails
ActiveSupport::Inflector.inflections do |inflect|
inflect.acronym 'SSL'
inflect.acronym 'iPhone'
end
"Always use SSL on your iPhone".titleize
# => "Always Use SSL On Your IPhone"
For those who speak the Queen's English (or who struggle to spell titleize), there's no .titleise alias but you can use .titlecase instead.

Answer 2

"HELLO WORLD HOW ARE YOU".gsub(/\w+/) do |word|
word.capitalize
end
#=> "Hello World How Are You"

Answer 3

While trying to come up with my own method (included below for reference), I realized that there's some pretty nasty corner cases. Better just use the method already provided in Facets, the mostest awesomest Ruby library evar:
require 'facets/string/titlecase'
class String
def titleize
split(/(\W)/).map(&:capitalize).join
end
end
require 'test/unit'
class TestStringTitlecaseAndTitleize < Test::Unit::TestCase
def setup
#str = "i just saw \"twilight: new moon\", and man! it's crap."
#res = "I Just Saw \"Twilight: New Moon\", And Man! It's Crap."
end
def test_that_facets_string_titlecase_works
assert_equal #res, #str.titlecase
end
def test_that_my_own_broken_string_titleize_works
assert_equal #res, #str.titleize # FAIL
end
end
If you want something that more closely complies to typical writing style guidelines (i.e. does not capitalize words like "and"), there are a couple of "titleize" gems on GitHub.

Answer 4

From ActiveSupport
"MY STRING HERE".gsub(/\b('?[a-z])/) { $1.capitalize }
If you are using Rails/ActiveSupport, the method is already available for free.

Answer 5

string = "MY STRING HERE"
string.split(" ").map {|word| word.capitalize}.join(" ")
The way this works:
The .split(" ") splits it on spaces, so now we have an array that looks like ["my", "string", "here"]. The map call iterates over each element of the array, assigning it to temporary variable word, which we then call capitalize on. Now we have an array that looks like ["My", "String", "Here"], and finally we turn that array back into a string by joining each element with a space (" ").

Answer 6

"MY STRING HERE".titlecase
Does the job (it's a method in the Rails gem, however)
http://apidock.com/rails/String/titlecase

Answer 7

Unicode-aware titlecase for Ruby 2.4.0+:
class String
def titlecase
split(/([[:alpha:]]+)/).map(&:capitalize).join
end
end
>> "я только что посмотрел \"леди исчезает\", и это чума!".titlecase
=> "Я Только Что Посмотрел \"Леди Исчезает\", И Это Чума!"
(based on https://stackoverflow.com/a/1792102/788700)

Answer 8

To catch any edge case such as:
str = "rUby on rAils"
Don't use:
str.titleize
Output: R Uby On R Ails
Use instead:
str.downcase.titleize
Output: Ruby On Rails

Answer 9

I've try to improve code... ready for critics and suggestions.
class Book
attr_accessor :title
def title=(new_title)
notcap=%w(and the a in of an)
str=''
new_title.gsub(/(\w|\s)\w+/) do |word|
word.strip!
if not notcap.include? word
word.capitalize!
end
str += ' ' + word
end
str.strip!
str = str[0].upcase + str[1..-1]
#title = str
end
end

Answer 10

The ruby core itself has no support to convert a string from upper (word) case to capitalized word case.
So you need either to make your own implementation or use an existing gem.
There is a small ruby gem called lucky_case which allows you to convert a string from any of the 10+ supported cases to another case easily:
require 'lucky_case'
# to get capital word case as string
LuckyCase.capital_word_case('MY STRING HERE') # => 'My String Here'
# or the opposite way
LuckyCase.upper_word_case('Capital Word Case') # => 'MY STRING HERE'
You can even monkey patch the String class if you want to:
require 'lucky_case/string'
'MY STRING HERE'.capital_word_case # => 'My String Here'
'MY STRING HERE'.capital_word_case! # => 'My String Here' and overwriting original
Have a look at the offical repository for more examples and documentation:
https://github.com/magynhard/lucky_case

Answer 11

Capitalizes every word in a sentence using ruby, without regex.. because unfortunately those scare me
class Book
attr_accessor :title
def title=(new_title)
result = []
words = new_title.split(' ')
words.each do |word|
capitalized = word[0].upcase + word[1..word.length].downcase
result.push(capitalized)
end
#title = result.join(' ')
end
end